Self-leveling elevator



Oct. 28. 1924.

J. E. BOYCE SELF LEVELING ELEVATOR Filed Feb. 14 1923 4 Sheets-Sheet l Swuem tot da@ fi Oct. 28, 1924. l 1,513,531

J. E.. BOYCE SELF LEVEIJlNG ELEVATOR Filed Feb. 14 192.3 4 Sheets-Sheet 2 Oct. z8, 1924. 1 1,513,531

J. E. .BOYCE SELF LEVELING ELEVATOR Filed Feb. 14 1923 4 Sheets-Sheel 5 'TI-q vwantoz Oct. 28. 1924. 1,513,531 J. E. BoYcE: .Y

SELF LEVELING ELBVA-TOR Filed Feb. 14 1923 4 Sheets-Sheet IIIIIIIIII Patented Oct. 28, 1924.

UNrrEDsTATas PATENT orner..`

JOHN E. BOYCE, F 'YONKERS, NEW YORK, ASSIGNOB. T0 OTIS ELEVATOB COMPANY, 0].F CITY, NEW JERSEY, A OOBJORATION 0F NEW JERSEY.

SELF-LEVELNG ELEVATOR.

`.application led February 14, 19723. Serial No. 618,897.

To all whom it may concern;

Be it known that I, JOHN E. Boron, a citizen of the United States, Aresiding in Yonkers, in the county of Westchester and State of New York, have inventedl a new and useful Im rovement in Self-Leveling.

sto level with the landing.4

n object of the present invention is to.

provide an improved controllin mechanism in the above mentioned type o electric ele-v vator for vcontrolling the 'operation of stopping the elevator and the car invariably evel with the landings.

. A further object of the 4present'invention is the provisionof novel means for operating the improved controlling mechanism to stopvthe elevator should the improved controllin mechanisml fail and not operate proper y, as of first intention, to control the operationv of stopping the car and thesubse uentstop ofy the car level with a landing.

till further objects of the present invention will appearl hereinafter in this specification. v

In the drawings accompanying this specification, Figure 1 illustrates a rearelevation view of the improved controlling mechamsm.

Figure 2illustrates a sectional side view in elevationv of an electro-magnet form of the improved controlling mechanism.

Figure 3 illustrates a sectional `side view in elevation of an electric moto-r form of the improved controlling mechanism.

Figure/illustrates another view in elevation, part `fragmentary and sectional of the electric motor form of mechanism.

Figure 5 illustrates still another view of the electric motor form of mechanism.

Figures 6, 7 8 and 9 represent in detail.

the various `positions of some of the parts of the mechanism.

Figure 10 represents a view of the operaty ing shaft of the mechanism.

Figure 11 is an end viewof the shaft. Fi re 12 is an end view of a bushing on the s aft of 'Figure 10.

Figure 13 is a view of the plunger of the magnet in the form of mechanism shownin Fi re 2.

igure-14 is an end view of the plunger in F 1 4ure 13.

igurev 15 represents the part broken olf of the Figure 2.

Figure 16 represents a wiring dia am of a' system of electrical circuits em od ing diaglrammatically the electric motor orm of t e present invention which may be used to control an electric elevator.

Similar reference characters refer to similar parts throughout the several views.

This invention of an improved controlling mechanism adapted to control the operation of stopping the elevator and stopping the car levelwith the landings, is positioned in the elevator well, as for instance on top of the car. v

Referring to the drawings, the machanism comprises a switch case 1 which together with a cover 2 `of the switch case encloses the switches and also certain other parts of the controlling mechanism. The switches are designated 3, 4, 5 and 6, and are held by rods7 and 8 in the switch case. Each switch comprises a movable arm 9 carrying an electrical contact 10 at one of its ends, ada ted to make electrical contact with anot er electrical contact 11 of the switch when it is moved to closed position, and the arm 9 also carrying at its other end a 'roller 12. A spring 13 of the switch moves the arm 9 to the closed position of the switch. A shaft 14, held in journals 15 formed on the side of the switch case 1, carries-on it and within the switch case a plurality of cam members 16, 17, 18 and 19, and outside of the case, the shaft carries two roller arms 20 and 21, the arms each carrying a rollerf22 at its free end. The roller' arms v20 and 21 extend out into the car hatchway and, from the top of the car where the mechanisml is positioned, into the path of groups of cams A and vB. Each group of cams comprises a cam 23 and a `cam 24 that are alixed to a side of the elef vit is desired that it be stopped at a predetermined floor landing, the roller arms 20 and 21 are caused at the proper time during loo the approach ofthe car to the landing, to assume a position, such that the rollers 22 of the arms will be-in the path ofthe cams .23 and-24 of the 'cam group; the roller V22 on one arm will, at a time depending upon the direction of the travel of the car, con,

sequently strike its corresponding y of the cam group of the desired floor landing, causing an operation of certain two of the switches of said controlling mechanism, the Y iirst switch to operate effecting a slowing,

down of the elevator and the second switch f to .operate effecting the stopping of the car level with the desired iioor landing.

Referring to Figure 2, the form of controlling mechanism shown thereincomprises an electro-magnet C placed on the switch case 1 asshown,.composed of a magnet coil 25v with a plunger 26 for the coil, which magnet coil when energized pulls the plunger up inf tothe coil, the movement ofthe plunger shown in Figure 2. is 1n its normal or'released position as shown serving to operate the switches of the controlling mechanism, as will be explained more fully hereinafter. When the ma Vet coil is deenergized, it releases itsV hol on the plunger which consequently drops due to Vgravity toits ori al norma-l position en the plunger 26 in Figure 2, it rests on a stop bolt 50 in the switch case'l Vvthat is adjustable and, therefore, thelength of the drop of the plunger is adjustable, `the bolt being held in adjusted position by a nut 51 thereon and bearing on the bottom side of the switch case.V The cam members,` 16, 17, 18l and 19 are mounted on the shaft 14, as before stated, the cam members V16 and 17 being directly carried on a `the bushing and shaft as shown in Figures 10, 11 and l2. To' the bushing 27 is keyed the roller arm 20, and to the shaft 14 is keyed the roller arm 21; movement of either roller arm separately will only move the cam members keyed, so to speak, to the roller arm moved, the cam members 16 and 17 being moved when the roller arm 20 is moved, and

the cam m'enrbers 18 and 19V being moved when the roller arm 21 ismoved: movement of both roller arms at one and the same time vwill move all of the cam members.

The movement of the cam members closes the switches of the controlling mechanism or permits them, to cl0se, as the case may be,

as will be explained hereinafter. `The cam members 17 and 18 have each two switch opera-ting arms; the switch operating arms.

of the cam'member 17 being designatedA 30 g and 31,'and the switchoperating arms of the -one on a seat 36-and the other on a seat 37, ofthe plunger 26 (see Figure 13) of the anism. Eachcam member v17 and 18 has also parts, 38 and 39, that carry in an opening that is clear through them a rod block 40 and a rod block 41 respectively, which support thethreaded end of each of rtwo sprlng rods 42 and 43 respectively, each springrod carrying a spring 44 and 45 respectively, and supported at their other ends in the switch case 1 at points 46 and 47 .respectively. `There are nuts 48 and v49 'on the threaded end of the rods 42 and 43, which hold the rodv blocks in position on their and 39 in proper position, but moreV particularly hold in the .pro er position the switch operating arms of t e cam, members with their respective switches. The cam members 16 and 19 are clam ed to and held in place on the shaft 14 as escribed before. The number 16 comprises a switch-operating arm 52,'and the cam member 19 comprises a switch-operating arm 53. The arm 52 is moved in one direction when the cam member 17 is moved by the plunger and the arm 53 is moved in one direction when the cam' member 18 is moved by the plunger; and the arm 452 when moved operates the switch 3 and the arm 53 the' switchV 6, as will be ex lained hereinafter more -in detail.

Re erring to Figures 3, 4 and 5, they show the electric motor form of myimproved controlling mechanism which form differs from the electro-magnet form in that an electric motor is substituted for the electro-magnet. vIn the Figures 3, 4 and 5, an electric'mot-or D ofthe series' type is shown, which may .be voperated either by direct or alternating current. The motor is su ported on a standard 54 and the standard on a base 55.v Another standard 56, is also supported 011V the` base, which latter is placed on the switch case 1, as show-n. I The motor has a shaft 57 upon which is a; piniongear 58 thatmeshes with another gear 59 keyed by` a key 60 to a pinion gear 61 that is fast on a shaft 62, in the motor standard 54; the

pinion gear 61 meshes with a gear 63 keyedy by a key to a shaft 65 supported in the motor standards 54 and 56. A' casing 66 4encloses the gear end of the'motor and the gears. Upon the shaft 65, between the mo- 'tor standards 54fa'nd 56, is a chainI block Q67V adapted to Wind on and o" a chain 68 fastened at oneof its ends to the block and its other end toa plunger` 69 that has `electro-magnet form of the controlling mechrods, and the rod blocks hold the parts 38 standard 56, to its seats 70 and 71 u on which rest the operating arms "34 an 35 of 'the cam members 17 and 18. The motor when'o rated turns the pinion gear 58 -on the ysha t 57 of same, which gear causes the other gears to. turn and the chain 68 is thereby wound on the block. 67 vand the `plunger 69 is therefore pulled up and also the operating arms 34 and 35 of the cam members 17 and 18, respectively, the switch-operating arms of the cam members operating their res ective switches of the mechanism as a resu t'in a manner as will be ex lained hereinafter. A stop collar l72 on t e shaft 65 arrests the motor in its operation, and consequently I furtherk movement of the gears and plunger 69. The sto collar isl turned when the motor operates, rom its position shown in the dotted lines, in Fi re l5, against a stop 73 held inl an arm fi lof the motor osition shown `in e dotted lines against a similar sto 75, also held in the arm-74, both stops stop collar forces t-he plunger 76 own in y ing adjustable iii the arm. The` stop 75 comprises a plunger 76, a spring 77, and. a plug 78, for holding the plunger and spring in place in a hollow cylinder 79 of t e sto t. The

the cylinder against the spring 77. When the stop collar is turned against the stop 75, as for example, yin this instance, the

motor D may be operated in a reverse di rection to'turn the stop collar from against the stop 75 to'and against the stop 73.

kThe stop 73 is similar to the stop `7 5. This form of stop furnishes a more or less lnoiseA -`less one. As long as there is current on e the motor, thel Vstop collar will be held against the stop V and theplunger be held lifted. With the plunger 69 lifted and 75, and the current be then cut Aoff from t e motor,

\. the

lunger 69, by its weight and -tlie weight of tlie operating arms 34 and 35 of the cam members 17 and 18 and the. action of the springs 44 and 45 moving the cam members, will drop to the stop 50, and the stop collar, gears vand motor will be turned in the direction opposite to the direction that they were turned by the motor when it turned the stop collarv `from the stop 73 to and `against the stop 7 5, and the stop collar will engage the stop 73, and the plunggrtifrest on the stop boltv 50. The'motor is lcontrolled to operate the control mechanism for operating the elevator, and :when the mechanism for starting the car is operated, the motor for operating cam members is o rated.

Referrin to .the cam mem rs 17 and 18,

they are a apted to o rate both of the two switches 4.and 5, as igure 1 shows. The

, bolt in the arms 30 and 32 of the cam members shown in the Figures 2, 3, 6k and ppsition likethe position of the cam memr,17 in Figure 7, the cam members 16 and 19 are at this time in a position like the position of the cam member 16 in Figure 9, and the-roller arms 20 and 21 in a position suchthat the roller 22 on each arm is on a line rpendicularwith each other as showxiin igure 9. While the rollers 22 are in this position they are free of the cams 23 and 24 of the cam groups at the various ioors, and the'movement of the elevator car'carries the rollers along a path. between the cams. The switches 4 and 5 were held -openbefore the operation of the motor D took place, the switch 4 by the arm 30 of the cam-member 17, Figure 6, and the switch 5 by the arm 32 of the cam member 18, Figure 2. In the new position of the .cam members 17 and 18, the switch 4 is held open by the arm 3l of the cani niember 18, and the switch 5 is held open by the arm 33 of the cam member 17, the latter mentioned arms of the cam members being adaptedv to engage the roller 12 of veach switch y4 and 5, as the former mentioned arms 30 and 32 leave the rollers, so that the allowed yswitch 6 to close, but as the circuits to these switches are adapted to be opened at this time elsewhere in the elevator control system, the closing of switches 3 and 6 is of no consequence at present Aother than that they have closed. It will be assumed that the car is beinfrv moved iii a down direction of car trave and it' is desired that it be stopped at the floor where the cams 23' and 24, in Figure 7, are, which floor is of no consequence in `this'present description other than it is not a floor at the top limit of travel -of the car. It will be further assumed that the car is within the near proximity of the floor, and the cai' operator being aware of the same brings his car ycontrol lever to the off or stopping position and cuts the power off from the v hoisting motor, or if the car is adapted to be automatically controlled, such controlling mechanismwill at this time cut off the power, the time in question of course being the proper time for either mechanism to operate. Such proper time for cutting off the power from the hoisting motor is when the roller 22 on the arm.21, in this instance, l

is; abreast of its cam 23, or so nearfthe cam that the car in coasting will carry theroller ofcthe roller -arm `upon to it, and as the power is adapted to be. cut off from the ymotor Dof the controllino` mechanism, when the car or hoisting machine mechanlsm cuts y free.from being held, and because the cam 24 is not in the way of its roller 22 at thls time, `the' roller arm v20moves to -itsfull free position.l The cam members 16= and 17 ,y fast to the 'bushing 27 thatthefroller arm 20 is `keyed to,1noved 'atthis' time to their normal positionsfas shown inFigures 8 and 6 respectively. Thecam'member 16 -in movingopened its' switch .3,1 while the cam memberl?, by itsarm' 30moving forward, so to speak, and the same movement' `of the cam'member 17, permits the switch ward, so to speak, in the movement ofthe cam member, moves toa posltlon to open its switch 4, see Figure 6, but finds that switch already opened by the' arm 31 of theA cam member 18, andthe arm 33' moving lback- 5fto close With the switch 6 already closed, and the switch 5 now closed, they establishA .circuits to a Vfast 'speed switchv and a directional switch for the elevator hoisting -m otor mechanism that the switches may operate and close circuits, either to one and the same rhoisting motor for continuing the v. .movementof the car and now adapted to operate at a greatly reduced speed,'or to a "second hoistingmotor now adapted to op- 4oerate atits fast speed, 'forit to continue `the movement ofthe car. As the car co'ntinues moving down, :in this' instance, the

1 ming surface, and if-the roller arm 21 is- Y going to function properly it will allow itsl roller 22. of the roller arm 21 rides on the vertical camming surface of thejcam 23,

keeping the switches 5 and 6 closed; finally the roller v22 rides off ofthe vertical camroller 22 tofollowv the cam on its incline camming surface.l As the roller 22 follows the' incline camming surface of the cam, the arm 21 is beingv 'slowly moved over tof wards itsnorm'al or full free position.

1 The first movement, vso to speak, ofthe roller 22 on the incline surface 'is' adapted to' permit suiic'ient movement; ofthe arm 21 vthat it will Vcause the cam memberA 194 fast tothe shaft 14 to which the roller' arm 21 in question is also fast,to move, fandopen its switch 6 which will openy a circuit to the fastspeed switch and cause atslow down of 122 continues moving on the incline cammin surface'- of the cam and Vfinally moves off o -the cam the roller arm 211has been moved car level with the further towards its normal position and finally ,tol its normal or full free position. The further movement of the roller arm has allowed the cam member v18, ralsofast'to the shaft 14 that the arm itself' isl fast to, to

,open by its arm 32, the switch 5, it openin a circuit to the down directional switch o the holstingmotor allowing itl to stop and `alsothe car level with the desired landing. l The speed vof the'car when controlled by the camsA isof 'so small a lvalue that the instant of cutting off of the powerfrom the hoistingy motor also brings a near or simultane- Vous stop of the car. Ther aboverdescription is of the' normal operation of stopping the ling` mechanism mentioned in the operation of stopping the car fails to or doesnot'operate properly as of rs't intention Vto control the operation of stopping'the car level with 'a landing, as related, for instance, should the roller 22 on the arm 21`by reason of some plone' fault or another remainin' a'positionas if the roller were still projected toy aline extended from the verticalicamming surface of the cam instead of`the roller following the incline surface of the camas it is designed it shall do, to operate the switches to stop the car. Referrlng to Figure?, it will be remembered that the switch 5 shown `there` in was closed in the operation of stop-ping operating arm `32 on the cam'member- 1 8 was .held back away from the switch by the roller` arm 21 being'heldV by its roller'v 22 against theA cam 23,-and because the other operating arm 33`of the switch on the cam member 17"tha/t held it open revious to its 'closing-was moved backwar VAto allow the 'switch tojclose, and the operating arm 33" lremembered that it was the operating arm 32 "S0 anding.` lf the control- .the` car atV the landing, in the fact that its of the'cam member 18 that kwas being moved y forward'when the roller of the roller arm 21 rode olf ofthe vertical camming surface and on the inclinecamming surface of the cam 23 that openedthe switch' 5 to stop the car level with the-landing.v If the roller arm v 21 remainI in the position as if the roller 22 thereon wasjstill riding on the vertical surface of the cam-23, the hoistingmotor would be still getting current through the switch 5 and would pull the car past the floor, because the operating arm 32 of the cam member 18` adapted to be moved to open the vrswitch 5 wasnotmoved, "and the operating` arm 32 did not move 'because the roller arm f fthe speed ofthe car, and later as -the roller f 21 did not move, which is shown in Figure 7. The instant'thatthe car proceeds past controlthe stopping of the car and stop' it level with a landing after an 'updirection of travel yof the car, will be moved. The roller' arm,l20 in Vthis instance of a down travel' of the car, willfbe moved to its operative posi# tion by the roller 22 thereon contacting with the'cam 24 as shown in Figurel 7. vAnd when the roller arm 20 is moved, so also is the cammember 17, that is fast to the bushing 27 that the roller arm 20 isv fast'to. 4The cam member 17 in moving will,fby its operating arm 33,-.which it will be remembered held open the switch 5 before itwas closed-g open at this time the switch 5,and with the switch open the car will cometo a stop. The car willhave been stopped, of course, below the landing, and it cannot be brought back at this time to a level stop with the landing, as ordinarily the controllinnr mechanism will do, because the cam member 18is' still in its operative position, vand theswitch 4, adapted to be in a circuit to the up direc-v;l tional switch of the motor, isheld open byff vthe operatingr arm 31 of the cam member 18 by reason of the roller arm 21 not having followed the incline surface of the cam and moved to itsy full free posi-tion... The car stopping below the landing as described, or if it had stopped above the landing because thev rollera'rm 2O had not moved properly, warns the car operator or the attendant in charge ofthe elevator that the controller'l` mechanism is yout of order andneeds attention. The foregoing description of operation was'of thev electric motor form of the controlling mechanism; thatform of `mechanism differs from the magnet form of controlling mechanismonly inthe means employed to lfree the roller 22 onfthe roller arms 20 and-21from the cams'23 and 24 -in the elevator hatchway andfmove thefarms-tov a perpendicular line with leachother in l order A description of the operationof the electric motor operated form of the controlling mechanism embodied in a system of elevator control will now be wr-1tten.,.g l v Referring to` Figure 16,A anwelevator car E operated by a car control'lever 82isl shown; movement of the lever to a position tothe left will cause the car to descend, and theoperationof the lever to the right will cause the 'car lto ascend. Assuming that it is desired t-o-cause the car to ascend, the` controllever 82 yis moved to" the right whichl brings a contact segment 83 thereon in con-y v switch.

tion'.

' tact with a contact 84-of the car switch that the lever is apart of, closing a' circuit as follows: from the plus main, by-w1re'85,

through the winding 86 of the up direction switch Fof the motor M, by wire 87,.contact 84, contact segment 83, by wire 88, to

the minus main. As a result of closing this.

circuit the winding. 86 pulls its: plunger 89.

up within itself and the plunger 89 affixed-- to the -upvdirection switch Fcloses the motor M forit to cause the car to ascend.

It is notfthoughtl necessary to trace out this circuit. Bythe switch F closing, a circuit" to the motor D-als'o'is closed as follows: from the plus main, through the ycontact 9() A circuit is thereby closed to the and plat'e91 of the up direction switch F,

contact 92 of the switch `F, wire 93,'thr0ugh the armature 94 and series field-95 of the.

motor D, lbywire 96 and 110 to the minus mam. .The-"motor D now operates fthecam members. and the roller arms 20 and 21, as

previously explained. The illustrationv of.

the `controlling mechanism in the Figure 16 is 'diagrammaticah and-it operates as follows-E VThemotor l) in. operatingturns thev shaftl and bushing supposedly to .bey the shaft 14 and bushingV 27 in the other figuresI andi-they in turning suitably move thek dia-gramme'd cam members; the arm 52 of.v

'the camY member 16- in moving from under the'switch' 3 allows the spring 13 of the switch to close it, thearm 30 of 'the'cam member 17 moves from under theswitch 4, butas theJarm 30 isfollowed up by the arm 31-of the cam member 18, the switch 4 is v kept;y open by the arm 31; the other arm lowed up by the other arm 33 of the cam member 17, so thatthe switch 5 is likewise kept Vopen,"and the arm 53 of the cam member 19 moving from under the switch 6 allows vthat switch to close.A Though` the switches 3 and 6 are closed, the circuit that theyare in is at this time open at the contact 97 of the switch F; the plate 98 ofthe moves from under the switch5 and is fol'A switch F is adapted to close the contact 97 with the contact 99 of the switch F, but at this Stime has been lifted off of the contacts 97vand 99 as the result of the'windingSB of the switch F drawing -its plunger 89 up'into itself. As the car nears the desired landing to be stopped thereat, the car controll lever 82 is brought to a center or offv position,

ythereby the circuit to the winding 86 ofthe. `up vdirection switch F is opened, and that switch opens and cutsl the power -oif from the motor M. The .up direction switch F in. vopening-has4 also yopenedV the circuit to.

the 'motor Dwwhich now allows the cam members to return to their normal positions,

andthero'ller arms to their full free posi- If the centering of the car lcontrol 1 lever' was made before the rollers reached;V .the.cams, 23 and 24, andthe car coasts' after the power is cut olf by the car control lever, and brings the roller 22 of the roller arm 20 into engagement with the cam 24 and the roller rides up on the cam, it will move its arm 20, which in time will cause the arm 52 of the cam member 16 to move from under the switch 3 and allow it to close and move the arm 30 of thecam member 1T from under the switch fl allowing that switch to close; the other arm 33 of the cam member 17 has moved-under the switch 5 to open it, but that switch is found to be already opened by t-he arm 82 -of the cam member 18 as the roller arm 21 that operates the cam member 18 was allowed to swing to its full freeposition; the movement ot' the arm 33 of the cam member to and under the switch 'was therefore at this time of no consequence. The arm 53 of the cam member 19 was also moved by the roller arm moving to its full free position. The arm 53 in moving opened the switch 6. Or again, if the car control lever is centered at the time, when the roller 22 Iof the arm 20 is abreast of the cam 24, the cam will not allow the arm 20 to swing to its full free position and consequently a result of the roller 22 of the arm 20 being on the cam, the arm 2O will close the switches 3 and 4 as described; The switch 8 in closing closed a circuit to the winding 100 of a fast speed switch G as follows: from the plus main, contact 9T, plate 98, and contact 99 of the up direction switch F, they now being closed together, by wire 101, contact 102, plate 108 and kcontact 104 of the down direction switch H, by wire 105, junction point 106, by wire 107, through the winding 100 of the fast speed switch G, by wire 108, the now closedcontacts of the switch 3, by wire 109, by wire 110, to the minus main. The switch et in closing closed a circuit as follows: from the plus main to junction point 106 as before, by wire 111, through the winding 112 of the up direction switch I of a motor M, by wire 113, through the now closedcontacts of the switch 4, by wire 114, by wire 115,l by wire 109 and by wire-110 to the minus main. Circuits are now yclosed to the windings 100 and 112 of the fast speed switch G and of the up direction switch I of the motor M', which windings operated their respective switches, and the switches in turn closed circuits for operating the motor l at its fast speed.

The fast speed switch Gr in operating inser-ted a resistance 116yk in circuit withr the field 117 of the motor M which serves to weaken the field and the fast speed of `the motor is thereby obtained. It is thought not necessary to trace out the circuit to the armature of the motor M. The fast speed of the motor M is much lower than the speed of,` the motor M, and consequently while the car is being operated by the motor Vto underneath the switch l, which will open slowly coming-.nearer the incline camming surface 'of the cam, and the first travel ot the. roller on the incline permits'the roller arm to move. further toward its normal po- .sition` which movement of the roller arm 20 moves the cam member 16 ui'iderneath the switch 8 which opens, opening the circuit to the fast speed switch G. will now operate 'on a reduced speed Yand the speed of the car will be reduced. As the roller moves further on the incline camming surface of the cam in the movement ot the car, the roller arm will eventually have moved far enough that it will operate the cam member 1l', whose arm 30 will return 7 opening the circuit to the winding of the up direction switch I which switch will open the circuit t'o the armature of the motor M which stops and the car stops level with the landing.

Having thus described land illustrated my invention, what I claim is:

The motor M 1. In a self-leveling elevator, leveling apparatus having means adapted to control the elevator to bring the car to a, desired floor landing and stop it thereat level with thelanding and emergency means to operate the first mentioned means and stop the elevator 'in case the first mentioned means fail' to operate to stop the car at the landing.

2. In a selfleveling electric elevator, the combination of the leveling apparatus coinprising a switch automatically operable for stopping the car level with a desired floor landing, and accessory means to operate said switch in case lit fail-normally to operate to stop the car.

3. In a self-'leveling electric elevator, the combination of the leveling apparatus comprising a switch automatically operable for stopping the car level with -a desired floor landing, and accessory means auton'latically operable to operate said switch in case it fail normally to operate to stop the car.

4. In a self-leveling electric elevator, the combination of the leveling .apparatus com'- prising a switch automatically operable for stopping the car level with a desired floor landing and having accessory means automatic-ally operable to operate said switch in case it fail normally to be automatically opera-ted to st'op the car. f

5. In a self-leveling electric elevator, a car leveling apparatus comprised of a self closing car leveling switch and means adapted to be operated to open the switch and allow the elevator to stop with the car .level with the desired floor landing and means adapted to be operated to open said switch in case the means first mentioned fail to open said switch.

6. In the self-leveling electric elevator art, a car leveling apparatus comprised of a self closing car leveling switch and movable arms, one arm adapted to be moved to open the switch and allow the elevator to stop with the car level with the desired ioor landing andthe other arm adapted to be moved t'o open said switch in case the arm first mentioned fail to operate to open the switch.

In the self-leveling electric elevator art, a car leveling apparatus comprised of a self f closing car leveling switch and movable arms, one arm adapted to be moved to hold the leveling switch open, and subsequently all'ow the switch to close for the leveling operation of the car and the other arm adapted to be moved to open the switch to stop the car level with a desiredfloor landing, but in case the said other arm tail to be moved to open the switch, then the arm first mentionedv to move to open said switch.

8. In a self-leveling electric elevator, the combination of the leveling apparatus comprising switches and sets of arms adapted to operate the switches, one set normally to operate the switches for stopping the car at al desired floor landing level therewith and the other set to operate said switches in case the first mentioned set ot arms fail to operate the switches to stop the elevator.

9. In a self-leveling electric elevator, the combination of the car, a hoistingmachine, the car switch, the leveling apparatus comprising a self closing leveling switch', anda member having a camming arm adapted to be moved against the leveling switch to hold the switch lopen during the time `ot control of the elevator by the car switch.

10. In a selilcveling electric elevator, the combination of the car, a hoisting machine, the car switch, the leveling apparatus comprising a seltl closing leveling switch, and a member having a camn'iing arm adapted to be moved against the leveling switch to hold the switch open, said arm controlled by the car switch. I

11. In a self-leveling electric elevator, the combination of the car, a hoisting machine, the car switch, the leveling apparatus comprising a self closing switch and a movable camming'arm adapted to be moved against the leveling switch to keep it open during the time of control of the elevator by the car switch, and electro-motive means controlled by the car switch adapted to move the arm that keeps the leveling switch open.

12. In a self-leveling electric elevator, the combination of the car, a hoisting machine, the car switch, the leveling apparatus comprising self closing leveling switches, one for up direction of travel of the car and the other for down direction of travel of the car, members associated with the switches, and having arms, the arm of the member associated with the up direction switch serving to hold open the down direction switch, and

the arm of the member associated with the down direction switch serving to hold open the up direction switch during the time of control of the elevator by the car switch.

13. In a selt-leveling electric elevator, the combination of the car, the hoisting machine, the car switch, the leveling apparatus comprising self-closing car leveling switches, members for said switches, each member having a movable camming arm, one arm for each leveling switch, electro-motive means to move said arms to hold the leveling switches open.

14. In a self-leveling electric elevator, the combination of the car, the hoisting machine, the car switch, the leveling apparatus comprising self closing leveling switches, movable members associated with the leveling switches, one member for each switch, the members each having an arm to hold the leveling switch open with which the other member is associated during the time of the car switch control of the elevator, and means to move the members to cause the arms to hold the leveling switches open.

15. In a self-leveling electric elevator, the combination of the car, the hoisting machine, the car switch, the leveling apparatus comprising` self closing leveling switches, movable members associated with the leveling switches, one member for each switch, the members each having an arm to hold the leveling switch open with which the other member is associated during the time of the car switch control of the elevator, and elec? tro-motive means to move the members to cause the arms to hold the leveling switches open.

16. In a self-leveling electric elevator, the

vcombination of the car, the hoisting machine, the car switch, the leveling apparatus comprising self closing leveling switches, movable members cooperatively associated with the leveling switches, one member for a switch, the members each having two arms, one arm to hold the leveling switch open with which the other member is associated, during the time of the car switch control of the elevator, and means to move the members to cause the arms to hold the leveling switches open until the car switch is brought to off position, and roller arms and devices in the shaft adapted to engage with the roller arms, one roller arm at a different time from the other roller arm to move the arm which was holding one of the switches open and allow that switch to close become disengaged from the cooperating device in the shaft to allow the other arm of the member associated with the same -switch to open it and the car to stop level with the. desired floor landing.

17. In a self-leveling electric elevator, the combination of the car, the hoisting machine, the car switch, the leveling apparatus comprising two self closing leveling switches, one for up and the other for down direction of travel of the car, two movable members cooperativelvassociated with the leveling switches one member for a switch, each member having two arms, one arm to hold the leveling switch open with which the other member is associated during the time of the car switch control of the elevator, and means controlled by the car switch to move the members to cause the arms to hold the leveling switches open until the car switch is brought to the"of'f position and two roller arms for the leveling switches, one for each switch and devices in the shaft to engage with said roller arms, one roller arm at a dii'erent time from the other roller arm to move the arm which is holding one of the leveling switches open to allow said switch Y to close to level the car with a desired floor landing and thereafter the roller arm for the leveling switch thus closed to become dis# engaged from its cooperating device in the shaft to allow the other arm of the member associated with the same leveling switch to open that switch for the car to stop level with the desired door landing, but if the car overruns said landing for the other i vroller arm to engage its cooperating device in the hatchway and move the other member to cause its other arm to allow the leveling switch associated with said other member to close to bring the car back to said landing, and thereupon the roller arm for the leveling switch last mentioned to become disengaged from its cooperative device in the shaft to allow said other arm of said other member to open the leveling switch in uestion to stop the car level with saidlan ing.

18. In a self-leveling electric elevator, the combination of the car, the hoisting machine, the car switch, the leveling apparatus comprised of two sell` closing leveling switches, one for up and the other for down direction of car travel, two movable members each having two levelingswitch operating arms; one arm of each member associated with one and the same switch and the other arm of each member associated with the other switch, one arm of each member adapted to hold open` the leveling switches during` the time the car switch controls the elevator, means controlled by the car switch to move the members to cause the arms to hold the leveling switches open until the car switch is brought to its offpositiom and two roller arms' for the leveling switches and devices in the shaft adapted to engage the roller arms, one roller arm at a different time from the other roller arm, and allow one of the arms which hold the leveling switches open to move to allow one of the leveling switches to close to level the car with the desired door landing, and thereafter the roller arm for the closed levelingA switch to become disengaged Vfrom its coop-A erative device in the shaft to allowthe other"\ arm associated with the said closed switch to move to open that switch to stop the car level with the floor landing, but if said roller arm upon disengagement from its cooperative device in the hatchway fail to move to allow the arm associated with the closed switch to open the switch to stop the car, then the other roller arm to enga-ge its cooperative device in the hatchway and move the arm which allowed the swtich to close but now to serve to openrthe switch and stop the car.

In testimony whereof, I have signed my name to lthis specification.

JOHN E. BOYCE. 

